Process for decolorizing oil with decolorizing earth in the presence of naphtha



Aug: 1Q W. .P I: PROCESS FOHDECOLORIZING OIL WITH DECOLQZIZING EARTH INTHE PRESENCE OF NAPHTHA Filed Dec. 2, 1939 COLOR R ESIDUE KETONE-NAPHTHA L WILLIAM P. GEE

N ENTOR HIS ATTORNEYS HEATER adhe ng to or retained insolid-jdecolorizing'ma- 'revivification of the ciay toja hi herdegreethan v in order to revivif ythe decolorizing material sublhepresent; application ifsfa'continu'at i in V gstantially to its'original'decolorizing; efiiciency. 'part'of my pendirig"application,gs,u. 296,568; More particularly, it concerns the removal of'col- "10 filedcsept'ernber 26, 1 1939, -forvirnprovements in s or claymaterials .usedin; the tr atmentger oils the aforesaidpendinpplicatiomas i1lus-- such as derived -from petro1'eum.-" The earth ioritrated, for examp1 e;. in .Ei

silicious materials such as magnesium silicates, rect' conjunctionwith'rials which are used to remove fco1oring matter ,5temperature.withreconditioned clay. Since the sorbent'materialcontaining acolorin g niatter, as thehotrnixtureof oiland reconditioned'clayjwas:

1a substantiallvoil-free,or deoiled adsorbent ma- 'orderto removeretainedoiland coloring rnatter.

a'solvent, suchasanaliphatic ketone, adapted30fincationjoftherecovery'process disclosed inthe to, dissolve orsdisplace the retained-coloring mat- I aforesaid application andwhichpriovide's forjhe,

" moved and the adsorbent-material isthen washed color-removalsolvelntfrom :thehotniigit lefof with a further 'quantity'of so1ve'nt,such as,naphfeed oil'and reconditioned'clay;

V renioval solvent. i T V v I U The invention is'particularly applicableto the .7 treatment of deco'lorizing clay such as used in'th'e processof he n nt tains 'a' substantial amount of oil; *for example, "thespent'or used claymay contain around ifliordesirable to "derail the clay: as:a preliminary} to' 4:5 lor itank'z' The flowof on iiso'regulatedi''a'continuousprocessfor=deoiling and extraction I a smavj Def-in th rf egabbu fi i I revivify and reconditionJthe-clay for-reuse. 50 Oil (42gal-10115) this without subjecting the contact clay to ex; mu p ped toa' he t ffi he f e em" :r sults-iniinjuryjto; and destructionj ot-thpartacting'. This' temperaturegmavbe'of the cm r Patented Aug; 10, 1943r V x 1 U T v I 2,s 26,2 95; j H ,IBOCESSZ;FOR .n coto'luzinc meme,

DECOLORIZINGEARTIH manna Pit-listing? mesne. assignments, to TheTexasflompany,"

-New York,;N; a corporation 'of'Delaw'are V This invention relatesjtorecovering andreobjectionable:wherethef claii or'ear-th a vivifyingadsorbent materials used inltreating' fragilenature. 1 f I hydrocarbonoils. L I A'furtheradvantagejof the. invention is the The inventionbroadly conte'rnplates a process utili'z ation-of a'closedcontinuous'systenradapted of removing coloring matter, oil, andotherbodies '5 to reduce so1vent, 10sses and to eifect recoverv'andterials used in the treatment'ofhydrocarbon oils heretofore and'inainore effective manner.

'oring matterjand .otherjimpurities from earth f, Recovering! andrevivi'fyin dsorbehtg natria s 'JZQQ m W clay'materials in:questionmayfcornnrise iullle'rs thereofgl .disclosda processfof emp1dy 'glt earth,activated clays, acid-treatdclavs, or otherf 'recovering, an'd'reconditmegm thec1aym di v v'treatntientofflubricabv""' for example. It iscontemplated thatltheproces's ingloil-stock. As.there idisclosed, .thelubricating is applicable to othertype sof adsorbent mate; oilstockfiwassubjected to-i'contact, ,at'elevated],

from oils; by adsorption.

V Y. 2'0 reconditioned clay retained some solvent, bot1, accordancewith, the invention-themed ad- I color-removalsolventand naphtha or oilsolvent,

well as}other impurities, including some oil -adi-isubjected}tojevanoration ;s0 as .to removeqthe'se sorbed during'conta'ct .with'hydrocarbonoil;is retained-solvents. .subsequently themixtureof I V treated with a solvent, such as petroleumn'alph 1.6i1 and;clay wassubjected to filtration tollrernovm tha, capable of dissolvingthe retained QiL-Y'Ihe the clay. Following this, the clav'wassubjectedsolvent and dissolved oil areremoved, leaving to treatmentwith'solvents,;as described above, in I -j terial. The de-o'iledmaterial is then treatedwith Thepresentapplicationihas todor vwith amod-; I

ter. 'The solventland dissolved mattjer are-reseparate removalinury.form of-the ketone' or I thajtdremove Or displace theretainedcolorjIngorder to describe {the invention -more reference will nowbe'madeto the accompanyingdrawing, 'fwhichf comprises a flow diagramofth Y i w q t men o ra 1 Referring to the drawing, tum re imentsteer; l qm 1 h d l v w 3' 1 b 4 such as a solvent-extractedoi1,*is-conductedjrom" stantial amount ofcolonng matter and also 're-.not'rshown n introduced t sme h aniig callyagitated: tank Into thistank;also flovv's 60% area by weight of theclay"It'isthereforex naphtha-ladenrecovered fi e clay"froma'ho'pperr r v solvent extraction:for theremoval of the-color i jg pgg f P- 4 zw t lq 3 ingmatter. The present,invention contemplates to 011-15 obtamed vt n T r ofthe coloring matterfromZ-the clayin order to lpoundS t0 typou nds of d y c aynerf a igrin-advantage oftlie invention is tolaccomplish T resulting m f D 1? JV cessive mechanical handling, since such handling pe a r i'a EdIt e ppe f e ,iQf-CP ticle structure of the clay, whi'chfi's' particularlytrim to 500 FL, forexample, viheniahighVis pended claims;

should be imposed as are I claim:

1. In the decolorizing of oil by contact with-3a decolorizing earthwherein the earth containing coloring matter'extracted from the oil isremoved indicated in t ap-' j a for reactivation involving treatmentwitha color solvent capable of extracting coloring matter from I theearth and washing with naphtha prior tof reuse, the reactivated claybeing wet with naphtha and retaining a smallamountof'colorsolvent,- themethod whichcomprises'heating a mixture of the oil and wet'reactivatedearth to an 3.'-In.-a process for I moved from'theoil' bylsai-dearthgthe method comprising heating a naphtha diluted'mixture' -f' of,oil and reactivated earth retaining some reelevated temperature ,atwhich coloring matter contained in the oil is extracted by the earth andat which naphtha and solvent'vaporize from the mixture, distilling fromthe heated mi xture a 1 distillate consisting essentially of colorsolvent and naphtha, separately removing; a second disf tillate ofnaphtha from said heated mixture, condensing said second distillate,cooling the retractingtfrom the earth the coloring matter vadsorbed"from the oil and then with naphtha, the

earth being contacted withthe color solvent the form of a slurry duringthe second mentioned washing, and returning reactivated earth wet withnaphtha and retainingsome color solvent to the heating treatmentf firstment ione-gl.

2. The method of decolorizin'g oilwhich comprises heating a mixtureofethe oil and reactivated decolorizingearth in'the presence of naph- Ftha and residual color solvent to arr-elevated tempera-ture for a periodof time'adequate to effect substantial decolorization, passing the,heated mixture to anevapor'ating zone and ther eva'p crating residualcolor solvent and some naphtha from thelearth-oil mixture while, saidmixture remains at an active decolorizing temperature, subsequentlyreducing the temperature of the remaining earth-oil mixturelbelow thatat which" a substantial vaporizationof naphthawouldv occur from themixture, diluting the coo-led mixture with additionalnaphtha sufficientto provide a mixture from which the earth can be efactivating theseparated earth by subjecting it in the form of a slurry to the actionofia color solvent-more volatile than the oi-l.being.decolor-' ized andcapable of extracting from the earth the coloring matter removediFrom'the'oiI bysaid earth, washing the reactivatedearth with naph- J rV tha to remove a substantial part or the'colorsolvent retained bytheearth, returning thej-reacti;

vated earth'wet with naphtha and containing residual color solvent fromthe-.,1ast;mentionedwashing treatment to the heating'treatment firstmentioned, and in said heating operation heating sidual eomr' solvent toan elevated contacting temperature and for aperiod I of time adequate toefiect" substantial decolorizationflofrthey oil; ,strip'ping solventdistillatecontaining zsaid re-f, I sidual solvent from-the mixture ofearth and 011 "j while the earth-oil mixture remains at:a decolor-Vizing temperature, substantially reducing the tern- 'perature ofthe;strippedearth-oil, mixture oe-1 I low said contacting temperature;diluting the; cooled mixturev with additional "naphtha to 'pro-i vide amixture irom' which the earth can be 're-] moved efiec'tivelybycontinuous filtration, se'pe arating the earthfromjthe dilutemixture,,sub

jecting the 'separa'tedearth to a: reactivating treatment by Washingwith naphthaand with a color solvent in'the form of a slurry, returningI the naphtha-laden reactivated earth retaining some residualcolorsolvent to .thefheating treat ment first mentioned'anplin-said'heatingiop eration; heating the mixture to a temperature highenough to efiect the evaporation of residual" i color solvent by flashevaporation.

4. In the decolorizing of oil by contact with a decolorizingeearthwherein the earth containing. color matter extracted' from the oilisremoved' for reactivation i'nvolvingtreatment with-a color solventcapable of extracting color'ing matter: I I from theearth and washingwith naphtha prior to re-us'', the reactivated earth fbeing 'wetwith;-;I I V naphtha and retaining a small amount of colon-w solvent, themethod'which comprisesheating a" mixture of the oil 'afndwet reactivatedearthto v a contacting temperature in the range about 400] 5 to 50Q F.,strippingfrom the heated mixture 'while still in the presenceofltheearth at a de I colorizing temperature a distillate. consisting es- Isentially of color solvent and naphtha, substantially reducingthei'temperatureof tliei'strippe'd earth-oil mixtulfibelow saidcontacting temperae ture, diluting the cooled mixture with additionalnaphtha to provide a' mixture from which the earth can be removedeffectively by continuous 3 filtration, separating; the, earth from thecooled dilute mixture, subjecting the separated earthto .-.-I,- areactivatingtreatmentby washingwith naph' I v thaancl with acolorisolventin the; former a' slurry, and returning the naphtha;ladnreaetig vatedearth'retaining some ,residual'color solvent t e intreatment firstmentionedi f the mixture to a temperature high enough toefi feet the evaporationof residual color solvent, by flash'evaporation. T i w I I decolorizing oilsfinvolving treatment of'the oil withdecolorizingearth in r? the presence-of naphtha wherein spentearth is' Iremovedjfrom thejoiland' reactivated by washing with naphtha andl-acolor solvent more volatile I than theoil being decolorizedla'nd'capableof exn tractin-gfrom the. earth thecoloring ma er-re

